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Which exhaust for a 172 Cup ?

  CUP with 219 bhp
The Cup is used for trackdays only, and once a week blast on a Sunday :)

I am looking for better performace / bhp increase. Don't care to much about how noisy it is... but it needs to be under the normal trackday limits. Which i think most are about
static 101dB & Drive-by 87.5dB

It's got a 182 Manifold with a Ktec - decat, and the rest is standard.

What do i put on ???